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Pushing AMD's Infinity Fabric to Its Limit
I recently wrote code to test memory latency under load, seeking to reproduce data in various presentations with bandwidth on the X axis and latency on the Y axis.
That’s well short of Infinity Fabric or DRAM bandwidth limits, so the latency test thread has a good chance of finding free queue entries for its own requests. But as performance counters and observations on Zen 2 show, AMD’s Infinity Fabric and memory controller do a good job of maintaining reasonable latency under load. Still, Zen 5 shows AMD is paying some attention to ensuring a good baseline level of performance for latency sensitive tasks, even when the memory subsystem is very busy.
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